JP2007183395A - Lens drive module and camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive module capable of positioning a lens in a reference position regardless of, for example, aging of each member composing a lens drive module and preventing an overload on each member, and to provide a camera module. <P>SOLUTION: The lens drive module configured so that when a moveable lens 9 reaches the reference position as it moves in an axial direction, the movable lens 9 is held in the reference position by restricting its movement in a reference plane P, includes: a drive motor 23 that has at least two coils, and rotates a rotor by an excitation current supplied to each coil, thereby supplying torque required for the movable lens 9 to move; a comparison means 57 that compares a set voltage and an induction voltage induced in one of the coils of the drive motor 23 by the rotation of the rotor and outputs an overload signal when the induction voltage has dropped to the set voltage or below; and a control means 59 for controlling so that the drive of the drive motor 23 is stopped at the point of time when the overload signal is inputted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens driving module and a camera module, and is particularly useful when applied to zooming or autofocusing by positioning a lens position at a reference position.

  2. Description of the Related Art Conventionally, some optical devices such as digital cameras include a driving unit using a stepping motor or the like as a driving source for moving a movable lens to a focus position with respect to a subject. In such an optical device, the position of the movable lens is detected by a sensor such as a photo interrupter to move it to a reference position, and the movable lens is moved by outputting a predetermined number of drive pulses to the stepping motor. Some control the position (see Patent Document 1).

  However, there is an error in the position detected by the photo interrupter due to manufacturing variations and aging of each member that occur when a lens driving module is configured by combining the above-mentioned driving means, sensors, and movable lenses. This causes a problem that it becomes difficult to accurately position the movable lens at the reference position.

  Therefore, the movable lens is moved until it comes into contact with a predetermined reference surface in the lens driving module, and the position at the time of contact is set as the reference position. That is, the reference position of the movable lens is determined when the movement of the movable lens is restricted by the reference plane. As a result, the influence of the detection position error described above can be removed, and the movable lens can be accurately positioned at the reference position.

However, even after the movable lens comes into contact with the reference surface, the stepping motor continues to drive, which causes a problem that the load applied to each member in the lens driving module increases. Therefore, if such an increase in load is left unattended, there is a risk of causing mechanical damage to each member. In particular, lens driving modules mounted on mobile phones, thin digital cameras, and the like have become smaller in mechanical strength with downsizing, so it is an important issue to deal with the problem of increased load. .
JP-A-6-281852

  In view of such circumstances, the present invention positions the movable lens at the reference position regardless of manufacturing variations and aging of each member constituting the lens driving module, and prevents each member from being overloaded. It is an object to provide a lens driving module and a camera module.

In order to achieve the above object, the first aspect of the present invention provides:
A lens driving module configured to restrict the movement of the movable lens to a reference position when the movable lens reaches a predetermined reference position as the movable lens moves in the optical axis direction, and to occupy the movable lens at the reference position. In
Torque when moving the movable lens in the optical axis direction via the power transmission mechanism by rotating the rotor in one direction or in the opposite direction by the excitation current supplied to each coil having at least two coils. A drive motor to supply,
An overload signal indicating this state is obtained when the induced voltage is equal to or lower than the set voltage by comparing the induced voltage induced in one of the coils of the drive motor by the rotation of the rotor and a predetermined set voltage. Comparing means for outputting;
The lens driving module further includes control means for controlling the driving motor to stop driving when the overload signal is input.

  In the first aspect, the movable lens is brought into contact with a predetermined reference surface and the drive motor is controlled to stop, thereby positioning the movable lens at a predetermined reference position without error and driving the lens due to overload. It becomes possible to prevent consumption and damage of each member of the module.

According to a second aspect of the present invention, in the lens driving module according to the first aspect,
The lens drive module further includes torque limit means for blocking transmission of the torque to the power transmission mechanism when the torque becomes a predetermined value or more.

  In the second aspect, it is possible to more reliably prevent each member of the power transmission mechanism from being damaged by interrupting the torque of the drive motor that has become a predetermined value or more.

According to a third aspect of the present invention, in the lens driving module according to the second aspect,
The power transmission mechanism includes a feed screw shaft that reciprocally moves the movable lens in the axial direction by rotation thereof, and an input gear that is fitted to the feed screw shaft via an elastic deformation portion provided at a central portion thereof. And
The lens drive module, wherein the torque limit means is configured to block the input of the torque to the power transmission mechanism when the elastic deformation portion is deformed by the action of the torque of the predetermined value or more. is there.

  In the third aspect, the torque limit means is configured with a simple structure, and the torque of the drive motor that exceeds a predetermined value is cut off, thereby preventing damage to each member of the power transmission mechanism more reliably. Is possible.

According to a fourth aspect of the present invention, in the lens driving module according to any one of the first to third aspects,
Further comprising position detecting means for detecting the position of the movable lens;
The control means may be a lens drive module that drives the drive motor so that the movable lens moves a predetermined amount after the position detection means detects the position of the movable lens.

  In the fourth aspect, the movable lens can be reliably brought into contact with a predetermined reference surface, and the movement of the movable lens is limited to a predetermined amount, so that the movable lens comes into contact with the reference surface. It is possible to prevent excessive torque from being continuously applied to the movable lens.

According to a fifth aspect of the present invention, in the lens driving module according to any one of the first to fourth aspects,
The movable lens is composed of two movable lenses, and the position where the other movable lens is in contact with the surface of one movable lens in a state regulated by the reference plane is defined as the reference position of the other movable lens. The lens driving module is characterized.

  In the fifth aspect, it is possible to set the reference position to be in contact with one of the movable lenses.

The sixth aspect of the present invention is:
The camera module is characterized in that an imaging device is combined with the lens driving module described in any one of the first to fourth aspects.

  In the sixth aspect, it is possible to provide a camera module that positions the movable lens at a predetermined position without error and prevents wear and breakage of each member of the lens driving module due to overload.

The seventh aspect of the present invention is
In the camera module in which the image pickup element is combined with the lens driving module described in the fifth aspect,
A base member constituting a camera module;
A fixed lens frame provided on the base member;
The position where the one movable lens is regulated by the surface of the fixed lens frame is set as a reference position of the one movable lens, and the other movable lens is placed on the surface of the one movable lens in the state of the reference position. The camera module is characterized in that a position where the lens abuts is set as a reference position of the other movable lens.

  In the seventh aspect, the position where one movable lens is in contact with the fixed lens frame can be set as the reference position.

  According to the present invention, by restricting the movement of the movable lens by the reference plane, the movable lens can be surely positioned at the reference position, and on the other hand, due to overload applied to each member constituting the lens driving module. It becomes possible to prevent consumption and damage of each member.

  Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an exemplification, and the present invention is not limited to the following description.

<Embodiment 1>
1 is an overall configuration of a camera module including a lens driving module according to a first embodiment of the present invention, FIG. 2 is a view taken along line II in FIG. 1, and FIG. 3 is II in FIG. -II line arrow view is shown.

  As shown in FIG. 1, a fixed lens frame 40 is provided on the base 1 constituting the camera module, and an imaging element (CCD camera or the like) 3 is provided on the rear surface (lower side in the figure) of the second fixed lens group 2. Is provided. A cover 4 that covers the second fixed lens group 2 is attached to the base 1, and the first fixed lens group 5 is disposed on the cover 4 at a position facing the image sensor 3 with the second fixed lens group 2 interposed therebetween. Is attached. The second fixed lens group 2 is attached to the fixed lens frame 40.

  In the inside of the cover 4 on both outer sides of the optical path openings of the first fixed lens group 5 and the second fixed lens group 2, the lens group extends in the optical axis direction (vertical direction in the drawing) across the base 1 and the cover 4. A first feed screw shaft 6 and a second feed screw shaft 7 as lead screws are rotatably supported. A first movable lens frame 9 is screwed into the threaded portion 8 of the first feed screw shaft 6, and a second movable lens frame 11 is threadedly engaged with the threaded portion 10 of the second feed screw shaft 7. The first movable lens frame 9 holds a first movable lens group 12, and the second movable lens frame 11 holds a second movable lens group 13.

  That is, when the first feed screw shaft 6 and the second feed screw shaft 7 are rotated, the first movable lens frame 9 and the second movable lens frame 11 are independently reciprocated in the vertical direction, and the first movable lens. The group 12 and the second movable lens group 13 are independently moved to an arbitrary position between the first fixed lens group 5 and the second fixed lens group 2. Thereby, zooming and zooming and autofocusing can be performed independently.

  As shown in FIGS. 1 to 4, a first guide shaft 15 and a second guide shaft 16 are provided across the base 1 and the cover 4 side. Guide plates 17 and 18 are provided on the first movable lens frame 9, and guide plates 19 and 20 are provided on the second movable lens frame 11. The guide plate 17 of the first movable lens frame 9 is provided with a through hole 17a, and the guide plate 18 is provided with a through hole 18a.

  The first guide shaft 15 passes through the through hole 17 a of the guide plate 17, and the second guide shaft 16 passes through the through hole 18 a of the guide plate 18. Similarly, the guide plates 19 and 20 of the second movable lens frame 11 are provided with through holes through which the first guide shaft 15 and the second guide shaft 16 pass, respectively.

  That is, the first guide shaft 15, the second guide shaft 16, and the guide plates 17, 18 allow the first movable lens frame 9 and the second movable lens frame 11 to reciprocate only in the vertical direction and move in the rotational direction. Restricted (rotation restricting means).

  As shown in FIGS. 1 to 3, a first drive motor 23 is attached via a motor fixing plate 22 between the base 1 and the cover 4 at the side of the first feed screw shaft 6. A second drive motor 24 is attached between the base 1 and the cover 4 on the side of the second feed screw shaft 7 via a motor fixing plate 22. The first drive motor 23 is a drive source for driving and rotating the first feed screw shaft 6, that is, a reciprocating movement of the first movable lens group 12, and the second drive motor 24 is a drive rotation of the second feed screw shaft 7, That is, it is a drive source for reciprocating the second movable lens group 13.

  A first drive pinion 25 is fixed to the output shaft at the lower end of the first drive motor 23, and a second drive pinion 26 is fixed to the output shaft at the lower end of the second drive motor 24. On the other hand, a first input gear 27 is provided at the lower end of the first feed screw shaft 6, and a second input gear 28 is provided at the lower end of the second feed screw shaft 7. A first intermediate gear 29 is rotatably provided between the first drive pinion 25 and the first input gear 27 via a train wheel bridge 31, and the first intermediate gear 29 is provided with the first drive pinion 25 and the first input gear 27. 27 is engaged. A second intermediate gear 30 is rotatably provided between the second drive pinion 26 and the second input gear 28 via a train wheel bridge 32, and the second intermediate gear 30 includes the second drive pinion 26 and the second input gear 28. It meshes with the input gear 28.

  That is, when the first drive motor 23 is driven, torque is transmitted to the first input gear 27 via the first drive pinion 25 and the first intermediate gear 29, and the first feed screw shaft 6 rotates. As the first feed screw shaft 6 rotates, the first movable lens frame 9 reciprocates along the first guide shaft 15 and the second guide shaft 16, and the first movable lens group 12 moves to a predetermined position. Hereinafter, a portion including the first feed screw shaft 6, the first drive pinion 25, the first intermediate gear 29, and the first input gear 27 is referred to as a first power transmission mechanism 52.

  Further, when the second drive motor 24 is driven, torque is transmitted to the second input gear 28 via the second drive pinion 26 and the second intermediate gear 30, and the second feed screw shaft 7 rotates. As the second feed screw shaft 7 rotates, the second movable lens frame 11 reciprocates along the first guide shaft 15 and the second guide shaft 16, and the second movable lens group 13 moves to a predetermined position. Hereinafter, a portion including the second feed screw shaft 7, the second drive pinion 26, the second intermediate gear 30, and the second input gear 28 is referred to as a second power transmission mechanism 53.

  Here, the reference position of the second movable lens frame 11 means that the surface of the second movable lens frame 11 on the base 1 side is in contact with the surface (reference surface Q) of the fixed lens frame 40 on the cover 4 side. Says the position. The reference position of the first movable lens frame 9 is the surface on the cover 4 side of the second movable lens frame 11 in the state where the surface on the base 1 side of the first movable lens frame 9 is at the reference position (reference plane P). ). Also, when each motor is driven when each movable lens frame has not reached the reference position, it is referred to as “normal time”, and each motor is driven with each movable lens frame reaching the reference position. This is called “overload”.

  Conventionally, in order to move each movable lens frame to the reference position, a control unit that controls driving of each motor drives the second drive motor 24 until the second movable lens frame 11 comes into contact with the reference plane Q. In addition, control is performed so that the first drive motor 23 is driven until the first movable lens frame 9 comes into contact with the reference surface. Accordingly, excessive torque is applied to each gear during overload as compared with normal operation, which may lead to wear and damage of the gear.

  As described later, the present invention includes a torque limit unit that mechanically cuts off excessive torque, and a control unit that stops the drive motor based on the overload signal received by the comparison unit. Prevents damage caused by

  First, the torque limit means will be described in detail.

  FIG. 5 is a perspective view of the feed screw shaft and the input gear. FIG. 6 is a diagram illustrating a configuration of the power transmission mechanism.

  As shown in FIGS. 5 to 6, the second input gear 28 is provided with an elastic deformation portion 28b, and the second feed screw shaft 7 inserted through the shaft insertion hole 28a is configured to fit into the elastic deformation portion 28b. ing. When the second feed screw shaft 7 is fitted into the shaft insertion hole 28a, the second feed screw shaft 7 is sandwiched by the elastic force of the elastic deformation portion 28b toward the center of the shaft insertion hole 28a.

  The second power transmission mechanism 53 configured as described above transmits or interrupts the torque of the second drive motor 24 as described below.

  That is, in the normal state, the second feed screw shaft 7 rotates integrally with the rotation of the second input gear 28 while being sandwiched by the second input gear 28 by the elastic force of the elastic deformation portion 28b. Therefore, the torque of the second drive motor 24 is transmitted to the second feed screw shaft 7 so that the second movable lens frame 11 can reciprocate.

  On the other hand, when the second drive motor 24 continues to drive the second movable lens frame 11 to move toward the reference plane Q, the second movable lens frame 11 contacts the reference plane Q and its movement is restricted. For this reason, the load applied to the second drive motor 24 increases, and a torque greater than a predetermined value is applied to the second input gear 28. As a result, the elastically deforming portion 28 b is deformed, and the second input gear 28 idles along the outer periphery of the second feed screw shaft 7. As a result, it is possible to prevent the second power transmission mechanism 53 from being damaged.

  Next, the control means will be described in detail.

  The control means stops the drive motor based on the overload signal received by the comparison means. Here, the overload signal refers to a signal indicating a state in which the driving motor is overloaded when the induced voltage generated in the coil of the driving motor is equal to or lower than a predetermined reference voltage.

  This overload occurs because the first drive motor 23 continues to supply the driving force even after the first movable lens frame 9 abuts on the reference plane P. Therefore, the detection of this overload is used as a trigger immediately. In addition, by stopping the first drive motor 23, it is possible to control the first movable lens frame 9 to be positioned at the reference position.

  First, the principle by which the comparison means detects an overload signal will be described with reference to FIGS.

  FIG. 7 is a schematic diagram of the configuration of the motor. FIG. 8 shows the characteristics of the induced voltage generated in the motor at low load and high load.

  The motor 70 includes a stator 71, a rotor 72, a permanent magnet 73, an iron core 74, a first coil 75 and a second coil 76. When a current flows between A1 and A2 of the first coil 75, a magnetic field is generated from the first coil 75, and the rotor 72 formed of the permanent magnet 73 rotates to generate torque.

  When the rotor 72 rotates, the magnetic flux penetrating the second coil 76 changes, so that an induced voltage is generated between B1 and B2 of the second coil 76 due to the principle of electromagnetic induction. This induced voltage is proportional to the inductance of the second coil 76, the magnetic field, and the rotational speed of the rotor 72.

  In the present invention, paying attention to the fact that the rotational speed and the induced voltage are in a proportional relationship, whether or not the rotor 72 is overloaded by detecting whether or not the induced voltage is equal to or lower than a predetermined reference voltage. Determine whether or not.

  As shown in FIG. 8, the rotational characteristics 81 and 83 of the rotor 72 indicate the speed at which the rotor 72 rotates following the current (excitation waveform 80) that flows between A1 and A2 of the first coil 75. The induced voltage characteristics 82 and 84 of the second coil 76 indicate the value of the induced voltage accompanying the rotation of the rotor 72. The rotational characteristic 81 and the induced voltage characteristic 82 are characteristics when the load applied to the rotor 72 is low, and the rotational characteristic 83 and the induced voltage characteristic 84 are characteristics when the load applied to the rotor 72 is overloaded. is there.

  In the rotation characteristic 81, the rotor 72 increases in speed from time T0 to time T1 following the rise of the signal shown in the excitation waveform 80. In comparison with this, in the rotation characteristic 83, the speed is gradually increased between the times T0 and T2. That is, when the rotor 72 is overloaded, it indicates that the rotation speed of the rotor 72 is lower than when the rotor 72 is under a low load. Therefore, since the induced voltage generated in the second coil 76 is proportional to the rotational speed of the rotor 72, the induced voltage V2 when the rotor 72 is overloaded is lower than the induced voltage V1 when the rotor 72 is under load.

  That is, by comparing the induced voltage generated in the second coil 76 with a predetermined reference voltage, it is possible to determine whether or not the rotor 72 is overloaded.

  Based on the principle described above, the camera module is configured with a comparator that detects the level of the induced voltage.

  FIG. 9 is a block diagram of a camera module configured using the above-described principle.

  As shown in the drawing, the lens driving unit 51 includes a first movable lens frame 9, a second movable lens frame 11, a first power transmission mechanism 52, a second power transmission mechanism 53, a first drive motor 23, and a second drive motor. 24. The control block 54 includes motor drivers 55 and 56, and drive commands are output to the first drive motor 23 and the second drive motor 24, respectively. A signal from the image sensor 3 is processed by the signal processing unit 60 and sent to the control unit 59 having a CPU and a memory, and is output to the motor drivers 55 and 56 and the display unit 61.

  Further, the control block 54 is provided with a first comparator 57 for controlling an overload signal of High when the induced voltage generated in the first drive motor 23 is higher than a predetermined reference voltage (Vref) and Low when it is lower. It is configured to output to the unit 59. The control unit 59 receives this signal. If the signal is low, the control unit 59 determines that the first drive motor 23 is overloaded, stops the first drive motor 23, and if the signal is high, Control is performed so that the first drive motor 23 continues to operate.

  Similarly, a second comparator 58 is provided, and is configured to output an overload signal to the control unit 59 that is High when the induced voltage generated in the second drive motor 24 is higher than a predetermined reference voltage, and Low when the induced voltage is low. . The control unit 59 receives this signal. If the signal is low, the control unit 59 determines that the second drive motor 24 is overloaded, stops the second drive motor 24, and if the signal is high, The second drive motor 24 is controlled to continue to operate.

  The control unit 59 may count the number of Low received from each comparator, stop the motor on the condition that the number of times has reached a predetermined number, or detect that the rising edge of the pulse signal has been detected. The motor may be stopped under the condition. Accordingly, for example, an induced voltage is generated in the drive motor due to an impact from the outside of the lens driving module, and it is possible to prevent a malfunction that the motor is stopped based on the induced voltage.

  FIG. 10 is a diagram showing a series of operations when the movable lens frame is moved to the reference position.

  First, the control unit 59 rotates the second drive motor 24 via the motor driver 56 and moves it to the reference position. As a result, an induced voltage is generated in the second drive motor 24. If the second comparator 58 compares the induced voltage with a predetermined reference voltage and the induced voltage is high, the controller 59 does not transmit an overload signal to the controller 59, and the controller 59 further includes the second drive motor 24. Outputs a drive command to keep rotating.

  As a result of continuing to rotate the second drive motor 24, when the second drive motor 24 comes into contact with the reference plane Q, the load applied to the second power transmission mechanism 53 and the second drive motor 24 increases. Therefore, on the other hand, the movement of the second movable lens frame 11 stops when the second input gear 28 idles. On the other hand, since the induced voltage generated in the second drive motor 24 decreases due to the increase in load, the second comparator 58 outputs an overload signal (Low) to the control unit 59. The control unit 59 stops the second drive motor 24 via the motor driver 56 based on this overload signal. Similarly, the first movable lens frame 9 is moved to the reference position.

  Note that, as in the prior art, a position detection unit such as a photo interrupter is provided, and the control unit 59 determines the reference plane P, from the position of the first movable lens frame 9 and the second movable lens frame 11 detected by the position detection unit. You may comprise so that a drive command sufficient to contact | abut to Q may be output. As a result, the amount of movement of each movable lens frame is limited. As a result, even if the comparison means does not normally output an overload signal due to a failure or the like, it is possible to prevent each member of the lens driving module from being damaged.

  As described above, the first movable lens frame 9 and the second movable lens frame 11 are brought into contact with the reference planes P and Q, respectively, to perform positioning at a reference position without error as in the prior art. Is possible. Further, by providing the torque limit means, the comparison means, and the control means for the overload caused by the contact of the movable lens frame, it becomes possible to prevent wear and breakage of each member of the lens driving module.

  INDUSTRIAL APPLICABILITY The present invention can be used in the industrial field of a lens drive module mounted on a digital camera, a camera-equipped mobile phone, and the like and used for autofocusing and zooming, and a camera module configured with the device. it can.

1 is an overall configuration of a camera module including a lens driving module according to a first embodiment of the present invention. It is the II arrow directional view in FIG. It is the II-II arrow directional view in FIG. It is a schematic block diagram which shows the structure of a movable lens frame. It is a perspective view of a feed screw shaft and an input gear. It is a figure which shows the structure of a power transmission mechanism. It is a block diagram of a structure of a motor. This is a characteristic of the induced voltage generated in the motor at low load and high load. It is a block diagram of a camera module. It is a figure which shows a series of operation | movement at the time of moving a movable lens frame to a reference position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 2nd fixed lens group 3 Image pick-up element 4 Cover 5 1st fixed lens group 6 1st feed screw shaft 7 2nd feed screw shaft 8, 10 screw part 9 1st movable lens frame 11 2nd movable lens frame 12 First movable lens group 13 Second movable lens group 15 First guide shaft 16 Second guide shaft 17, 18, 19, 20 Guide plate 22 Motor fixed plate 23 First drive motor 24 Second drive motor 25 First drive pinion 26 second drive pinion 27 first input gear 28 second input gear 29 first intermediate gear 30 second intermediate gear 31, 32 wheel train receiver 40 fixed lens frame 51 lens drive unit 52, 53 power transmission mechanism 54 control block 55, 56 Motor Driver 57 First Comparator 58 Second Comparator 59 Control Unit 60 Signal Processing Unit 61 Display Unit 70 Motor 71 Stator 72 B Ter 73 permanent magnet 74 core 75 first coil 76 second coil 80 excitation waveforms 81 and 83 rotational property 82,84 induced voltage characteristic

Claims (7)

A lens driving module configured to restrict the movement of the movable lens to a reference position when the movable lens reaches a predetermined reference position as the movable lens moves in the optical axis direction, and to occupy the movable lens at the reference position. In
Torque when moving the movable lens in the optical axis direction via the power transmission mechanism by rotating the rotor in one direction or in the opposite direction by the excitation current supplied to each coil having at least two coils. A drive motor to supply,
An overload signal indicating this state is obtained when the induced voltage is equal to or lower than the set voltage by comparing the induced voltage induced in one of the coils of the drive motor by the rotation of the rotor and a predetermined set voltage. Comparing means for outputting;
A lens driving module comprising: control means for controlling to stop driving of the driving motor when the overload signal is input. The lens driving module according to claim 1.
A lens drive module, further comprising torque limit means for interrupting transmission of the torque to the power transmission mechanism when the torque exceeds a predetermined value. The lens driving module according to claim 2, wherein
The power transmission mechanism includes a feed screw shaft that reciprocally moves the movable lens in the axial direction by rotation thereof, and an input gear that is fitted to the feed screw shaft via an elastic deformation portion provided at a central portion thereof. And
The lens drive module, wherein the torque limit means is configured to block the input of the torque to the power transmission mechanism when the elastically deforming portion is deformed by the action of a torque equal to or greater than the predetermined value. In the lens drive module in any one of Claims 1-3,
Further comprising position detecting means for detecting the position of the movable lens;
The control means drives the drive motor so that the movable lens moves a predetermined amount after the position detection means detects the position of the movable lens. In the lens drive module according to any one of claims 1 to 4,
The movable lens is composed of two movable lenses, and the position where the other movable lens is in contact with the surface of one movable lens in a state regulated by the reference plane is defined as the reference position of the other movable lens. A lens driving module.   6. A camera module, wherein an imaging device is combined with the lens driving module according to claim 1. In the camera module which combined an image sensor with the lens drive module according to claim 5,
A base member constituting a camera module;
A fixed lens frame provided on the base member;
The position where the one movable lens is regulated by the surface of the fixed lens frame is set as a reference position of the one movable lens, and the other movable lens is placed on the surface of the one movable lens in the state of the reference position. A camera module characterized in that a position where the lens abuts is set as a reference position of the other movable lens.

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